The road outside of our house has deep ruts in the snow caused by vehicle tires always driving along the same path. As you drive in the ruts, its familiar and comfortable at first, kind of like you are on the track of an amusement ride— you don't really need to pay attention because the tires are directed by the track.
After awhile though its uncomfortable because you feel stuck and can't get off. In fact, when you do try to get out of them, your tires struggle against the walls of the ruts. When they finally do jump out, your vehicle slides uncontrollably sideways on the icy ridges, till you take control of where you are going again.
Its amazing how the ruts in our lives happen in such a similar way.